자바 uniqid()

1 개요

자바 Util.uniqid()

public static long currentTimeNanos() {
	return System.nanoTime() + ((System.currentTimeMillis() * 1000000) - System.nanoTime());
}
public static String uniqid() {
	long nanos = currentTimeNanos();
	return Long.toHexString(Long.parseLong(String.valueOf(nanos).substring(0,10)))
			+ Long.toHexString(Long.parseLong(String.valueOf(nanos).substring(10,16)));
}
public static String uniqid(String prefix) {
	return prefix + "_" + uniqid();
}
...
System.out.println( Util.uniqid() );
System.out.println( Util.uniqid() );
System.out.println( Util.uniqid("hello") );
System.out.println( Util.uniqid("hello") );
// 58eddeabe0db9
// 58eddeabe0f60
// hello_58eddeabe0f96
// hello_58eddeabe0fc2

2 전체 예제

public class HelloApplication {
	public static long currentTimeNanos() {
		return System.nanoTime() + ((System.currentTimeMillis() * 1000000) - System.nanoTime());
	}
	public static String uniqid() {
		long nanos = currentTimeNanos();
		return Long.toHexString(Long.parseLong(String.valueOf(nanos).substring(0,10)))
				+ Long.toHexString(Long.parseLong(String.valueOf(nanos).substring(10,16)));
	}
	public static String uniqid(String prefix) {
		return prefix + "_" + uniqid();
	}
	public static void main(String[] args) {
		System.out.println( uniqid() );
		System.out.println( uniqid() );
		System.out.println( uniqid("hello") );
		System.out.println( uniqid("hello") );
		// 58eddeabe0db9
		// 58eddeabe0f60
		// hello_58eddeabe0f96
		// hello_58eddeabe0fc2
	}
}

3 같이 보기

• 자바 Util.currentTimeNanos()
• 함수 uniqid()